This project belongs to the field of new energy vehicle technology. The development of electric vehicles has been identified as an important way to improve the competitiveness of my country's automobile industry, ensure energy security and develop a low-carbon economy. However, due to the fact that previous technologies of electric vehicle powertrain multi-energy control systems have great shortcomings in terms of complete functional requirements, reliable identification of driver intentions, formation of a complete fault handling mechanism, and good software and hardware integration platform, Electric vehicles cannot fully exert their best performance in terms of fuel economy, power, comfort, safety, etc., which is very unfavorable to the marketization of electric vehicles. In response to the above problems, the project team, with the strong support of multiple "863" plan projects of the Ministry of Science and Technology and the strong support of the Shanghai City Science and Technology Commission, the Economic and Information Commission and other departments, has successfully developed a multi-energy (engine, power battery or super capacitor, etc.) control system with complete functions for electric vehicle powertrain, and has achieved large-scale industrialization.
After repeated demonstrations, this project has comprehensively improved and innovated the functional characteristics of the electric vehicle powertrain control system, made up for the inherent defects that previous technologies were difficult to fully consider power, safety and other aspects, and met the interface standardization goals and actual requirements. After many rounds of technical research and innovation, the following four innovative results have been achieved:

1. In response to the problem that battery health and the mutual influence of heat dissipation of various components were not fully considered in the past, it was the first to simultaneously achieve the goals of fuel economy and battery health through multi-energy real-time energy management, and to regard multiple heat sources such as engines, motors, batteries or super batteries. As an integrated system, without dividing their respective connections, forming a unified multi-heat source efficient thermal management, which ultimately significantly improves the fuel economy of electric vehicles, the service life of power batteries and the reliability of the work of various components;
2. Aiming at the problems of reduced safety and single fail-safe handling mechanism caused by the previous use of "black and white" regenerative braking, a braking energy feedback control method that combines multiple factors such as driver intention, driving conditions, transient compliance transition and control intervention has been invented., and integrates complex faults of the entire vehicle components into the system level for composite diagnosis and redundancy processing, which greatly improves the comfort and safety of electric vehicles;
3. Taking advantage of the computing advantages of multi-core processors, the multi-energy control system has added battery state estimation functions. In order to solve the problem of large battery state of charge (SOC) estimation errors caused by aging and other factors, an accurate battery state estimation algorithm combining linear autoregression modeling method and extended Kalman filtering method has been created to improve the accuracy of battery SOC estimation (the error is only ±2.5%);
4. Expand the DC conversion control function of the electric-electric hybrid energy storage system of the multi-energy control system. In order to solve the problem of low efficiency of hard-switching DC conversion in the past, it is the first time that the DC conversion of the electric-electric hybrid energy storage system is coupled with inductor resonant soft switching control method, so that the DC conversion of the hybrid energy storage system achieves optimal working efficiency (about 96%).
   This project has authorized a total of 11 invention patents, 1 utility model patent, applied for and disclosed 6 invention patents, published 1 Chinese and English book, and published more than 70 domestic and foreign papers, including 42 SCI or EI searches. The results of this project have been used on a large scale in the electric cars produced by Shanghai Huapu Automobile Co., Ltd., the power system provided by Shanghai Jineng Bus Power System Co., Ltd., and the electric bus products produced by Shanghai Shenwo Bus Co., Ltd., achieving direct economic benefits and an added output value of 471.9 million yuan, a profit of 234.3 million yuan, and a tax revenue of 84.83 million yuan. It has been promoted and applied to electric vehicle products produced by Dongfeng Motor Company, achieving an indirect benefit output value of 210 million yuan.
   The results of this project have played an important role in promoting the demonstration operation, product promotion and industrial upgrading of electric vehicles in my country, and have greatly promoted the scientific and technological progress of my country's new energy vehicle technology. The innovative technology of this project can also be widely used in many fields such as new energy ships and smart grid energy management systems, which will greatly promote technological innovation and leapfrog development in related fields.